That's the problem... I'm searching and searching the literature for ways to convert it... nitrosation, Wolf-Kishner, Clemmensen, hydrolysis, aminolysis and drawing mechanisms to find some other way... though without any luck...
This compound doesn't seem too popular in the publications i've read...
Perhaps the epoxidation step isn't necessary if a clemmensen (Zn, HCl) could reduce the carbonyl, leaving the double bond untouched. This could later be followed by nitrosation or epoxidation just like a propenylbenzene...
Bla bla bla... I'll post the mechanism instead...